/Engine/Plugins/Enterprise/DataprepEditor/Source/DataprepCore/Public/DataprepOperation.h
This function is the same has OnExcution, but it's the extension point for an operation defined in c++. It will be called on the operation execution.
virtual void OnExecution_Implementation ( const [FDataprepContext](API\Plugins\DataprepCore\FDataprepContext) & InContext )